BLADE TYPE DRILLING BITS COMPRISING A SERIES OF STEPS WHICH ARE TIPPED WEAR-RESISTANT CUTTING ELEMENTS OF NATURAL AND/OR CYNTHETIC DIAMOND, INCLUDING POLY- CRYSTALLINE SUPERABRASIVE COMPOSITE MATERIALS AND COMBINATIONS THEREOF, FOR USE IN ROTARY AND TURBINE DRILLING SOFT THROUGH HARD FOUNDATIONS

'and/or':20 'bit':4 'blade':1 'combin':30 'composit':27 'compris':5 'crystallin':25 'cut':16 'cynthet':21 'diamond':22 'drill':3,38 'element':17 'foundat':42 'hard':41 'includ':23 'materi':28 'natur':19 'poli':24 'resist':15 'rotari':35 'seri':7 'soft':39 'step':9 'superabras':26 'thereof':31 'tip':12 'turbin':37 'type':2 'use':33 'wear':14 'wear-resist':13

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